摘要:
The invention pertains to methods and devices for the long term, in vitroculture of hematopoietic progenitor cells in the absence of exogenously added hematopoietic growth factors, improved methods for the introduction of foreign genetic material into cells of hematopoietic origin, and to apparatus for performing these methods. The hematopoietic progenitor cells are cultured on a three-dimensional porous biomaterial. The three-dimensional porous biomaterial enhances hematopoietic progenitor cell survival and leads to an expansion of progenitor cell numbers and/or functionality, while maintaining progenitor cell pluripotency in the absence of exogenous growth factors. In addition, the three-dimensional porous biomaterial supports high level transduction on cells cultured upon such environment.
摘要:
The invention pertains to methods and devices for the long term, in vitroculture of hematopoietic progenitor cells in the absence of exogenously added hematopoietic growth factors, improved methods for the introduction of foreign genetic material into cells of hematopoietic origin, and to apparatus for performing these methods. The hematopoietic progenitor cells are cultured on a three-dimensional porous biomaterial. The three-dimensional porous biomaterial enhances hematopoietic progenitor cell survival and leads to an expansion of progenitor cell numbers and/or functionality, while maintaining progenitor cell pluripotency in the absence of exogenous growth factors. In addition, the three-dimensional porous biomaterial supports high level transduction on cells cultured upon such environment.
摘要:
A method of enhancing the rate of transistor gate corner oxidation, without significantly increasing the thermal budget of the overall processing scheme is provided. Specifically, the method of the present invention includes implanting ions into gate corners of a Si-containing transistor, and exposing the transistor including implanted transistor gate corners to an oxidizing ambient. The ions employed in the implant step include Si; non-retarding oxidation ions such as O, Ge, As, B, P, In, Sb, Ga, F, Cl, He, Ar, Kr, and Xe; and mixtures thereof.
摘要:
A supporting structure that deployed resembles a spoked wheel which is retractable into a compact volume by virtue of hinged rim and reelable spokes that is an efficient and stable structure for storing, deploying and supporting surfaces such as radar and communications antennas, shielding, earth sensing, solar cell arrays and solar energy reflectors.
摘要:
An interactive tour guide system includes software downloaded from a tour-guide web site to a PDA (portable digital assistant) or tablet laptop computer. The user indicates his geographic location to the interactive tour-guide device by entry on a dynamic city map. Intelligent agent software responsive to a request from the user creates a customized tour program. The intelligent agent guides the user along the customized tour route by voice, video and/or graphics, and provides information about each exhibit on the tour. The downloaded interactive tour guide system provides interactive guided tours, theme guided tours and a self-guided “wander mode” tour. The virtual tour-guide system can personalize each directed tour by taking individual user expressed preferences into account, and can use collaborative filtering of experiences with prior users to suggest other exhibits which may be of interest to the present user. The interactive tour-guide system responds like a human tour-guide to the needs of the user.
摘要:
Reticulated composites are formed with a thin coating of a ductile biocompatible metal such as tantalum on a brittle biocompatible substrate such as vitreous carbon. Such composites exhibit physical properties that permit these monolithic composites to be morselized, or sized and shaped manually. Such composites exhibit surfaces with excellent ductile metal biocompatibility properties, but with strength and fracture physical properties that are more characteristic of the brittle substrate than of the ductile metal. Such composites fracture easily, and may be morselized or worked by manual sizing and shaping. Such morselization and working is accomplished by breaking or fracturing the composite, rather than plastically deforming it. Morselized or manually shaped reticulated composites exhibit excellent biocompatibility characteristics with micro- and nano-textured surfaces that promote rapid bone ingrowth and adhesion. When the composite is broken, the substrate is exposed. The presence of exposed substrate does not significantly impair the biocompatibility of these composites.